Year	% of tax revenue
2005	23.293630870636857
2006	22.073977552563115
2007	21.083064721870862
2008	20.538554183981816
2009	20.850990539820312
2010	21.078498303840302
2011	21.33734050344711
2012	21.48992003958366
2013	20.7844350715958
2014	21.850452574836606
2015	20.4074681652773
2016	22.08916699112961
2017	20.775671762566496
2018	19.83012806725531
2019	19.816442815858675
2020	20.33798481022085